This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A296831 #4 Dec 21 2017 12:43:13 %S A296831 13,70,402,2441,14379,85500,508111,3017667,17931240,106532750, %T A296831 632991179,3760963266,22346554371,132779031876,788937821061, %U A296831 4687716596985,27853628252239,165500927720484,983379261249186,5843086041423489 %N A296831 Number of nX5 0..1 arrays with each 1 adjacent to 0, 3 or 5 king-move neighboring 1s. %C A296831 Column 5 of A296834. %H A296831 R. H. Hardin, <a href="/A296831/b296831.txt">Table of n, a(n) for n = 1..210</a> %e A296831 Some solutions for n=6 %e A296831 ..0..0..0..1..0. .0..0..0..0..1. .1..1..0..0..0. .0..0..0..0..0 %e A296831 ..1..0..0..0..0. .1..0..0..0..0. .1..1..0..0..0. .0..0..0..0..0 %e A296831 ..0..0..0..0..0. .0..0..1..0..0. .0..0..0..0..1. .0..0..1..0..1 %e A296831 ..1..1..0..1..0. .0..0..0..0..1. .0..1..1..0..0. .0..0..0..0..0 %e A296831 ..1..1..0..0..0. .0..0..1..0..0. .0..1..1..0..0. .0..0..0..1..0 %e A296831 ..1..1..0..0..0. .0..0..0..0..1. .0..1..1..0..1. .0..1..0..0..0 %Y A296831 Cf. A296834. %K A296831 nonn %O A296831 1,1 %A A296831 _R. H. Hardin_, Dec 21 2017